Method and apparatus for system access in system using beamforming

ABSTRACT

The present invention relates to an method and an apparatus for upward access, and the method for upward access according to one embodiment of the present invention can comprise the steps of: receiving, from a base station, a synchronization QO channel, a broadcasting control channel and a secondary reference signal; selecting a transmission beam which transmits an upward access signal by using received results from at least one of the synchronization channel, the broadcasting control channel and the QO secondary reference signal; transmitting the upward access signal by using the selected transmission beam; and receiving, from the base station, an access response and initial set-up information of the control channel as a response for the upward access signal. According to the one embodiment of the present invention, the upward access steps can efficiently perform a beam selection.

TECHNICAL FIELD

The present invention relates to a system access method and apparatus.

BACKGROUND ART

With the advent of smartphones, average data usage amount of mobilecommunication subscribers increases exponentially and contributes to thestrong demand for high data rage. Typically, a high data rate can beachieved in such a way of increasing frequency bandwidth or improvingfrequency utilization efficiency. In the latter case, the currentgeneration communication technologies have almost reached to thetheoretical limit of the frequency utilization efficiency, it isdifficult to further increase the frequency utilization efficiencythrough technical improvement. Therefore, a feasible approach toincrease the data rate is to broaden the frequency band for dataservice. At this time, the available frequency band should beconsidered. Since the frequency band available for broadbandcommunication in the bandwidth over 1 GHz is limited under the currentfrequency distribution policy, it is proposed to use the millimeter waveband over 30 GHz for wireless communication. However, such ahigh-frequency band communication has a drawback in that the signalattenuation increases significantly as the propagation distanceincreases. In detail, as the frequency increases, the propagationpathloss increases and the propagation distance decreases, resulting inreduction of the service coverage. One of the promising technologies tosolve this problem is beamforming which concentratestransmission/reception power to narrow space to increase thetransmission/reception efficiency.

FIG. 1 is a diagram illustrating a base station 100 and a mobile station150 supporting the beamforming with array antennas. Referring to FIG. 1,the base station 100 is capable of transmitting data changing thedirection of a downlink transmission beam 120 using the array antennas110 and 112. Also, the mobile station 150 is capable of receiving datachanging the direction of the reception beam 170.

In the communication system using the beamforming technique, the basestation 100 and the mobile station 150 select the transmission beam 120and the reception beam 170 showing the best channel condition amongvarious transmission beam directions and reception beam directions toprovide the data service. Such a procedure is applied identically to theuplink channel for transmitting data from the mobile station 150 to thebase station 100 as well as the downlink channel for transmitting datafrom the base station to the mobile station.

It is assumed that a number of transmission beams directions of the basestation 100 is N and a number of reception beams directions of themobile station 150 is M. In this case, the simplest method for selectingthe best downlink transmission/reception direction is that the basestation 100 makes a trial to transmit a predetermined signal in Nindividual transmission directions at least M times and the mobilestation 150 makes a trial to receive N transmission beams 120 using Mreception beams 170.

In this case, the base station 100 has to transmit a specific referencesignal at least N×M times and the mobile station 150 has to receive thereference signal N×M times to measure the received signal strength. Themobile station 150 may select the directions showing the highestmeasurement values as a combination of the best transmission beamdirection and reception beam direction. The procedure in which the basestation 100 transmits the signal at least one time in every availabledirection is called beam sweeping, and the procedure in which the mobilestation 150 combines the best transmission and reception beam directionsis called beam selection. This process of selecting the best downlinktransmission beam and the beat downlink reception beam (hereinafter,referred to as Transmission beam and Reception beam) can be appliedidentically to the uplink transmission procedure for transmitting datafrom the mobiles station 150 to the base station 100.

In a normal cellular system, the base station 100 transmits the commoncontrol channels such as Synchronization Channel (SCH) and BroadcastChannel (BCH) within the whole coverage area of the base station 100.The base station 100 also has to receive the uplink access channel(Random Access Channel (RACH)) transmitted within the coverage′ area. Inthe communication system using the beamforming technology as shown inFIG. 1, the base station 100 has to transmit the above channels in everyavailable direction at least once in the above-described beam sweepingmanner to transmit the SCH and BCH within the whole coverage area of thebase station 100. Also, in order to receive the uplink access channelstransmitted within the whole coverage area of the base station 100, thebase station 100 has to make a trial to receive the uplink accesschannel in every available direction at least once in the beam sweepingmanner.

DISCLOSURE OF INVENTION Technical Problem

The present invention has been proposed to solve the above problem andaims to provide a random access method and apparatus for selecting abeam efficiently.

Solution to Problem

In accordance with an aspect of the present invention, an uplink accessmethod of a mobile station includes receiving a synchronization channeland a broadcast control channel from a base station, selecting atransmission beam for transmitting an uplink access signal based on aresult of receiving at least one of the synchronization channel andbroadcast control channel, transmitting the uplink access signal usingthe selected transmission beam, and receiving an access response and acontrol channel initial configuration information from the base stationin response to the uplink access signal.

In accordance with an aspect of the present invention, a connectionconfiguration method of a mobile station includes receiving an accessresponse and control channel initial configuration information,transmitting an uplink control channel based on the control channelinitial configuration information, transmitting a connection requestmessage based on scheduling information included in the received accessresponse, and receiving a contention resolution and connectionconfiguration information.

In accordance with another aspect of the present invention, a mobilestation for performing uplink access includes a communication unit whichreceives a synchronization channel, a broadcast control channel, and asecond reference signal and a control unit which selects a transmissionbeam for transmitting an uplink access signal based on a result ofreceiving synchronization signal, the broadcast control channel, and thesecond reference signal. The communication unit transmits the uplinkaccess signal through the selected transmission beam and receives anaccess response and control channel initial configuration informationfrom the base station in response to the uplink access signal.

In accordance with an aspect of the present invention, a mobile stationincludes a communication unit which receives an access response andcontrol channel initial configuration information, transmits an uplinkcontrol channel based on the received control channel initialconfiguration information, transmits a connection request message basedon scheduling information included in the received access response, andreceives a contention resolution and connection configuration messagefrom a base station.

In accordance with another aspect of the present invention, an uplinkaccess response method of a base station includes receiving an uplinkaccess signal from a mobile station, acquiring a best downlinktransmission beam indicator from the uplink access signal, andtransmitting a response signal through a downlink transmission beamindicated by the downlink transmission beam indicator.

In accordance with another aspect of the present invention, a basestation for performing uplink access response includes a communicationunit which receives an uplink access signal from a mobile station and acontrol unit which acquires a downlink transmission beam indicator fromthe uplink access signal. The communication unit transmits a responsesignal and control channel initial configuration information through adownlink transmission beam indicated by the downlink transmission beamindicator.

In accordance with another aspect of the present invention, a connectionconfiguration method of a base station includes receiving an uplinkcontrol channel and a connection request message from a mobile stationand transmitting a contention resolution and connection configurationmessage.

In accordance with still another aspect of the present invention, a basestation for perform uplink configuration includes a communication unitwhich receives an uplink control channel and a connection requestmessage and transmits a contention resolution and connectionconfiguration message.

Advantageous Effects of Invention

The random access method and apparatus of the present invention isadvantageous in terms of selecting a beam efficiently in the uplinkaccess procedure.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a diagram illustrating a base station 100 and a mobile station150 supporting the beamforming with array antennas.

FIG. 2 is a diagram illustrating a frame structure of the communicationsystem operating based on beamforming according to an embodiment of thepresent invention.

FIG. 3 is a diagram illustrating transmission and reception beams foruse in channel transmission of the base station according to anembodiment of the present invention.

FIG. 4 a is a diagram illustrating a procedure of transmitting/receivingsynchronization channel, broadcast control channel, and DL narrow beamreference signal using multiple beam widths proposed in the presentinvention.

FIG. 4 b is a diagram illustrating a frame structure used by the basestation operating with a plurality of beam width according to anembodiment of the present invention.

FIG. 5 a is a diagram illustrating a procedure of transmitting/receivingthe UL access signal according to an embodiment of the presentinvention.

FIG. 5 b is a diagram illustrating a frame structure used by the basestation operating with a plurality of beam width according to anembodiment of the present invention.

FIG. 6 is a diagram illustrating a frame structure carrying the narrowtransmission beam group information according to an embodiment of thepresent invention.

FIG. 7 a is a diagram illustrating the procedure of exchanging responsesignals corresponding to the UL access signals transmitted/receivedbetween the base station 401 and the mobile station 405.

FIG. 7 b is a diagram illustrating a frame structure having a resourceregion for transmitting/receiving the access response signal accordingto an embodiment of the present invention.

FIG. 8 a is a diagram illustrating a procedure of establishing aconnection based on the information exchanged between the base station401 and the mobile station 405 in the access procedure.

FIG. 8 b is a diagram illustrating a frame structure including theresource for use in the procedure of FIG. 8.

FIG. 9 is a flowchart illustrating the access response procedure of thebase station 401 according to an embodiment of the present invention.

FIG. 10 is a flowchart illustrating the UL access signal transmissionprocedure of the mobile station 405 according to an embodiment of thepresent invention.

FIG. 11 is a block diagram illustrating the configurations of the basestation 401 and the mobile station 405 according to an embodiment of thepresent invention.

MODE FOR THE INVENTION

Exemplary embodiments of the present invention are described withreference to the accompanying drawings in detail.

Detailed description of well-known functions and structures incorporatedherein may be omitted to avoid obscuring the subject matter of thepresent invention. This aims to omit unnecessary description so as tomake the subject matter of the present invention clear.

For the same reason, some of elements are exaggerated, omitted orsimplified in the drawings and the elements may have sizes and/or shapesdifferent from those shown in drawings, in practice. The same referencenumbers are used throughout the drawings to refer to the same or likeparts.

Descriptions are made of the uplink access method and apparatusaccording to embodiments of the present invention hereinafter withreference to accompanying drawings.

A number of times of transmission/reception operations for transmittingthe synchronization channel and broadcast channel and receiving theuplink access channel in the beam sweeping manner is in proportion tothe number of transmission and reception beams present in the coverageof the base station. Accordingly, the simplest method of reducing thetransmission/reception overhead of the broadcast type channels andaccess channel is to support the whole coverage area of the base stationwith a smaller number of the transmission and reception beams. In orderto achieve this, it is necessary to widen the beam width of each of thetransmission and reception beams. For example, in order to cover a 60degree sector with two transmission or reception beams, each of thetransmission and reception beams has to be formed with a beam width of30 degree.

However, as the beam width is widened, the beamforming effect decreasesin inversely proportion to the beam width. That is, the beamformingeffect increases as the beam width decreases. If the beam width isdecreased to increase the beamforming effect, the number of transmissionand reception beams necessary for covering the service area of the basestation increases proportionally so as to increase the broadcast typechannel transmission overhead. That is, the beamforming effect and thebroadcast channel transmission overhead have a trade-off relationship.

In order to overcome this problem effectively, it can be considered todiversify the beam width for use in transmitting the broadcast channeland receiving the access channel and the beam width for use intransmitting/receiving user data. For example, it is possible to use thetransmission beam with the beam width of 30 degree for the broadcastchannels and the transmission beam with the beam width of 10 degree forthe user data in the 60 degree sector. In the case of using multiplebeam widths as in the above example, the transmission beam having arelatively wide beam width is called wide beam or coarse beam. Incontrast, the transmission beam having a relatively narrow beam width iscalled narrow beam or fine beam.

In order to start data transmission/reception in the beamforming systemusing multiple beam widths, a procedure of transmitting thesynchronization channel and the broadcast channel using the wide beamfirst. Through the uplink access procedure with the wide beam, the beasttransmission and reception beams are selected among the wide beams (widebeam selection procedure). Afterward, a narrow beam for use in datacommunication is selected finally through a procedure of selecting thebest narrow beam (narrow beam selection procedure). The procedure ofdetermining the beam for use in data communication through the two beamselection processes causes data channel configuration delay andincreases system complexity due to the use of different beam widths intransmitting/receiving signals.

The present invention proposes an efficient beam selection procedure forthe transmitter and receiver to configure a communication channel in thesystem operating based on beamforming with multiple beam widths.

Also, the present invention proposes a method for performing the uplinkaccess procedure and connection configuration procedure efficientlyusing the transmission/reception beams having one or more beam widths.

Also, the present invention proposes a method for utilizing thetransmission/reception beams having different beam widths for accessingsignal transmission/reception through uplink access channel and fortransmitting/receiving response signal to the uplink access orconnection configuration message.

Also, the present invention proposes a method for transmitting theinitial setup information of the uplink/downlink control channel for usein the connection setup procedure along with the access response signalafter the uplink access signal transmission/reception.

Also, the present invention proposes a method for configuring newcontrol channel information in completing channel configuration to themobile station through the connection setup procedure.

Also, the present invention proposes a method for the mobile station toreceive the synchronization channel and the broadcast control channel,which are transmitted by the base station using the wide transmissionbeam, and the narrow beam reference signal, which is transmitted usingthe narrow transmission beam, using a plurality of reception beams, andto transmit the uplink access signal efficiently using the aboveinformation.

Also, the present invention proposes a method for the mobile station totransmit the uplink access signal including the information on the beastdownlink wide beam or beast downlink narrow beam group.

Also, the present invention proposes a method for the mobile station toreceive an access response and transmit detailed downlink beaminformation and channel information additionally using the uplinktransmission/reception beam information and control channel initialsetup configuration information transmitted along with the accessresponse signal.

FIG. 2 is a diagram illustrating a frame structure of the communicationsystem operating based on beamforming according to an embodiment of thepresent invention. Referring to FIG. 2, a frame includes a plurality ofsubframes that are sorted into downlink (DL) duration and uplink (UL)duration. In FIG. 2, the DL and UL durations are discrete on the timeaxis. According to an alternative embodiment of the present invention,the DL and UL durations may be discrete on the frequency axis. Here,part of the DL duration is defined as synchronization/broadcast channelregion 210. The synchronization/broadcast channel region 210 includes asynchronization channel (SCH) region for transmitting synchronizationsignal between the base station and the mobile station and broadcastchannel (BCH) region for broadcasting control information within thewhole coverage of the base station. A part of the DL duration is definedas the duration 220 for transmitting a DL transmission narrow beamreference signal (NB-RS). In the frame structure of FIG. 2, part of theUL duration is used as UL control block 230. The UL control block 230may carry the UL access signal, DL channel quality information, DL bestnarrow beam information, and DL Hybrid ARQ (HARQ) acknowledgementsignal.

FIG. 3 is a diagram illustrating transmission and reception beams foruse in channel transmission of the base station according to anembodiment of the present invention. According to this embodiment, thebase station 300 transmit the DL synchronization channel and DLbroadcast control channel using the wide beams (WB1, WB2, WB3, and WB4)having a relatively wide beam width. The base station 300 transmits theDL narrow beam reference signal (NB-RS) or DL data channel using thenarrow beams (NB1 a, NB1 b, NB1 c, NB1 d, and NB1 e) having a relativelynarrow beam width. The base station 300 also receives the UL accesssignal using the wide beams (WB1, WB2, WB3, and WB4) like the DLsynchronization channel and DL broadcast control channel or using thenarrow beams (NB1 a, NB1 b, NB1 c, NB1 d, and NB1 e) like the DL datachannel. The base station 300 receives the UL data channel using thenarrow beams (NB1 a, NB1 b, NB1 c, NB1 d, and NB1 e) having the narrowbeam with like the DL data channel.

In the embodiment of FIG. 3, the description is made under theassumption that the beam width for DL transmission of the base stationis identical with the beam width for UL signal reception. According toan alternative embodiment, however, the transmission/reception beamshaving different beam widths may be used in downlink and uplink.

According to an embodiment of the present invention, the initial UL/DLcontrol channel configured through the access response signal is thechannel on which contention may occur between mobile stations. In thecase that a plurality of mobile stations uses the same control channel,the channel may not be received correctly. In the following, a methodfor configuring a new contention-free control channel information incompleting the channel configuration to the mobile station through theconnection setup procedure.

According to an embodiment of the present invention, a base stationtransmits the synchronization channel and the broadcast control channelusing the wide beams and the reference signal for DL narrow beam usingthe narrow beams and receives the UL access channels using the widebeams or narrow beams. According to an embodiment of the presentinvention, the base station may select a DL narrow beam or a DL widebeam for use in transmission of the response to the uplink access usingthe best DL wide beam information or narrow beam group informationincluded in the UL access channel. According to an embodiment, theaccess response may include the best UL narrow beam information andUL/DL control channel initial setup information for use in theconnection setup procedure. According to an embodiment of the presentinvention, the base station may configure the contention-free newcontrol channel information in completing the channel configuration tothe mobile station through the connection setup procedure.

According to an embodiment, the mobile station may receive thesynchronization channel and the broadcast control channel, which aretransmitted by the base station using the wide transmission beam, andthe narrow beam reference signal, which is transmitted using the narrowtransmission beam, using a plurality of reception beams. The mobilestation may transmit the UL access signal efficiently using the aboveinformation. According to an embodiment of the present invention, themobile station may include the best DL wide beam information or the bestDL narrow beam group information in the UL access signal. According toan embodiment of the present invention, the mobile station may transmitdetailed DL beam information and channel information using the ULtransmission/reception beam information and the control channel initialsetup information transmitted along with the access response signalafter the receipt of the access response.

FIG. 4 a is a diagram illustrating a procedure of transmitting/receivingsynchronization channel, broadcast control channel, and DL narrow beamreference signal using multiple beam widths proposed in the presentinvention.

Referring to FIG. 4 a, the base station 401 transmits the SCH andPrimary BCH (P-BCH) a plurality of times repeatedly using a plurality ofwide transmission beams within the whole coverage area of the basestation at step 402. The base station 401 transmits a Secondary BCH(S-BCH) a plurality of times repeatedly using a plurality oftransmission beams within the whole coverage area of the base station atstep 403. The base station 401 also transmits the narrow beam referencesignal (NB-RS) a plurality number of times repeatedly using a pluralityof narrow transmission beams within the coverage area of the basestation. Here, the P-BCH and S-BCH is referred integrally to asBroadcast control Channel (BCH).

In the procedure of FIG. 4 a, the mobile station 405 attempts to receivethe SCH using a plurality of reception beams to establishsynchronization with the base station. The mobile station 405 alsoattempts to receive the P-BCH using a plurality of reception beams. Themobile station 405 also attempts to receive the S-BCH to acquire systeminformation at step 407. The mobile station 405 determines theper-reception beam reception performances of the SCH and BCH transmittedwith the wide beams in the course of attempting receipt of the SCH andBCH using the plural reception beams at step 406. Through thisprocedure, the mobile station 405 is capable of selecting the best DLwide transmission beam among the wide transmission beams and the bestreception beam associated with the best DL wide transmission beam. Themobile station 405 may receive the S-BCH transmitted by the base station401 using the selected best reception beam at step 406.

Afterward, the mobile station 405 attempts to receive the NB-RS, whichthe base station 401 transmits with the narrow beams as denoted at step404, using a plurality of reception beams as denoted at steps 408 or409. The mobile station 405 may attempt to receive the NB-RS at leastonce using all reception beams at step 409. The mobile station 405 alsomay attempt to receive the NB-RS using part of the reception beams thatshow relatively good reception performances based on the wide beamreception performances measured in the procedure of receiving the SCHand BCH at step 408. Steps 408 and 408 may be performed selectively.Upon receipt of the NB-RS transmitted by the base station 401, themobile station 405 is capable of selecting the best narrow transmissionbeam among the narrow beams and the best reception bema associatedtherewith based on the NB-RS reception performance.

FIG. 4 b is a diagram illustrating a frame structure used by the basestation operating with a plurality of beam width according to anembodiment of the present invention.

The SCH and P-BCH transmitted using the wide transmission beam at step402 of FIG. 4 a may be mapped to the SCH/P-BCH region 401 predeterminedbetween the base station and the mobile station in the frame structureof FIG. 4 b.

Also, the S-BCH transmitted using the wide transmission beam at step 403of FIG. 4 a may be mapped to the S-BCH region 412 in the frame structureof FIG. 4 b. The S-BCH region 412 may be predetermined between the basestation 401 and the mobile station 405 or informed through dynamicscheduling of the base station. In the case that the location of theS-BCH region 412 is determined dynamically, the correspondinginformation may be transmitted to the mobile station 405 through theP-BCH of the SCH/P-BCH region 410 or the scheduling channel (PDCCH). TheNB-RS transmitted with a plurality of narrow transmission beams at step404 of FIG. 4 a may be mapped to the NB-RS region 411 in the framestructure of FIG. 4 b. The NB-RS region 411 is the region in a subframepredetermined between the base station 401 and mobile station 405 orinformed through dynamic scheduling. In the case that the location ofthe NB-RS region 411 is determined dynamically, the correspondinginformation may be transmitted to the mobile station 405 through the BCHof the SCH/P-BCH region 410 or the S-BCH region 412.

FIG. 5 a is a diagram illustrating a procedure of transmitting/receivingthe UL access signal according to an embodiment of the presentinvention. The procedure of FIG. 5 a may follow the procedure of FIG. 4a.

FIG. 5 b is a diagram illustrating a frame structure used by the basestation operating with a plurality of beam width according to anembodiment of the present invention.

Referring to FIG. 5 a, the base station 401 attempts to receive the ULaccess signal through a UL control block (UL-CBLK) 507 as a resourceregion reserved in the frame structure using a plurality of receptionbeams at step 502. Alternatively, the base station may attempt toreceive the UL access signal using a plurality of narrow reception beamsat step 503. Steps 502 and 503 may be performed selectively.

In the embodiment of FIG. 5 a, the base station 401 which has attemptedto receive the UL access signal using the plural wide reception beams ornarrow reception beams may determines the best transmission beam inuplink and the best wide reception beam or the best narrow receptionbeam associated therewith based on the reception performance of the ULaccess signal received in diverse directions.

In the embodiment of FIG. 5 a, the mobile station 405 transmits theuplink access signal through the uplink control block 507 using one ormore transmission beams in one or more reception beams directionsrepeatedly at step 505 or 506. At step 506, the mobile station 405 mayuser all available transmission beams. The mobile station 405 may useonly some transmission beams selected among the available transmissionbeams at step 505. Steps 505 and 506 may be performed selectively. inorder to determine the uplink transmission beam for use in UL access andthe corresponding reception beam at steps 505 and 506, the best DL widetransmission beam and narrow transmission beam selected in the procedureof FIG. 4 a and the information on the reception beam associatedtherewith. In this embodiment, the mobile station 405 transmits the ULaccess signal including the best DL wide transmission beam indicationinformation or best DL narrow transmission beam group indicationinformation repeatedly.

The UL-CBLK region 507 for transmission of the UL access signal of themobile station 405 at step 505 or 506 may be predetermined between thebase station 401 and mobile station 405 or indicated through dynamicscheduling.

FIG. 6 is a diagram illustrating a frame structure carrying the narrowtransmission beam group information according to an embodiment of thepresent invention. In the embodiment of FIG. 6, the narrow beams(NB1˜NB24) are grouped into several groups (NB group 1˜NB group 6). Thismakes it possible to reduce the overhead caused by exchanging the narrowtransmission beam (NB1˜NB24) indication information. In the embodimentof FIG. 6, the 24 available narrow beams (NB1˜NB 24) are sorted into 6groups of 4 each (NB group 1˜NB group 6). The detailed information onthe narrow beam groups (NB group 1˜NB group 6) may be shared in advancebetween the base station 401 and the mobile station 405 through the DLBCH 410 or 412 of FIGS. 4 a and 4 b.

FIG. 7 a is a diagram illustrating the procedure of exchanging responsesignals corresponding to the UL access signals transmitted/receivedbetween the base station 401 and the mobile station 405.

FIG. 7 b is a diagram illustrating a frame structure including theresource region for transmitting/receiving the access response signalaccording to an embodiment of the present invention.

In the procedure of FIG. 5 a, the base station 401 receives the accesssignal which the mobile station 405 transmits one or more times. Uponreceipt of the access signal, the base station 401 may determine the atleast one DL narrow transmission beam or DL wide transmission beam to beuse for transmitting a response signal in response to the access signalat step 702 or 703 based on the best DL transmission beam indicationinformation or the best DL narrow transmission beam group indicationinformation included in the access signal.

In the case that a group of narrow beams are defined as shown in FIG. 6,the base station 401 may receive the best narrow transmission beam groupindication information. Upon receipt of the best narrow transmissionbeam group indication information, the base station 401 may select atleast one narrow beam among the narrow beams belonging to thecorresponding group to transmit the response signal in reply to the ULuplink signal at step 702. According to an alternative embodiment, thebase station 401 may select the DL wide transmission beam correspondingto the narrow transmission beam group based on the received best narrowtransmission beam group indication information to transmit the responsesignal to the mobile station 405 in reply to the UL access signal atstep 703. Steps 702 and 703 may be performed selectively.

According to an alternative embodiment of the present invention, thebase station 401 may determine the scope of the DL narrow transmissionbeam to be used for transmitting the response signal in reply to theaccess signal based on the best DL wide transmission beam indicationinformation. In order to accomplish this, there has to a relationship of1:n between the wide and narrow transmission beams in this embodiment.The simple method for defining such relationship is to map one widetransmission beam and all the narrow transmission beams transmitted onthe region (or direction) in which the wide transmission beam istransmitted. For example, the relationship between the wide transmissionbeam (WB1) and all the narrow transmission beams (NB1 a, NB1 b, NB1 c,NB1 d, and NB1 e) transmitted in the same direction may be defined. Inthe example of FIG. 3, such relationship may be defined between the widetransmission beam (WB2) and narrow transmission beams (NB2 a˜NB2 e),between the wide transmission beam (WB3) and narrow transmission beams(NB3 a˜NB3 e), and between the wide transmission beam (WB4) and narrowtransmission beams (NB4 a˜NB4 e), respectively. The narrow transmissionbeams NB2 a˜NB2 e, NB3 a˜NB3 e, and NB4 a˜NB4 e are omitted in FIG. 3.

In this embodiment, upon receipt of the best wide transmission beamindication information, the base station 401 may select at least onenarrow transmission beam among the narrow transmission beamscorresponding to the wide transmission beam to send the mobile station405 the response signal in reply to the UL access signal. According toan alternative embodiment of the present invention, upon receipt of thebest DL wide transmission beam information, the base station 401 maysend the mobile station 405 the response signal in reply to the accesssignal using the best DL wide transmission beam.

The access response signal transmitted at steps 702 or 703 of FIG. 71includes a Temporary ID (TID) to be used in the procedure of the accessof the mobile station 405, information on the best UL transmission beamdetermined in the procedure of FIG. 5 a, control channel initial setupinformation to be used in the channel configuration procedure followingthe access response procedure, and scheduling information on theresource for use in the channel configuration procedure, or at leastpart of them. The whole or part of the information may be transmittedseparately but along with or with the access response signal.

In this embodiment, the initial UL/DL control channel configured throughthe access response signal or a separate signal is the channel on whichcontention may occur among plural Mobile stations. In the case that theplural Mobile stations use the same control channel, the channel may notbe received correctly.

At step 707 of FIG. 7 a, the mobile station 405 attempts to receive theDL access response signal transmitted using at least one DL narrowtransmission beam or the best DL wide transmission beam. At step 707,the mobile station may receive the DL access response signal using thebest reception beam determined through the procedure of FIG. 4 a. In theabove procedure, the mobile station 405 is capable of improving theaccess response signal reception performance by receiving the DL accessresponse signal more than once and combining the DL access responsesignals.

In this embodiment, upon receipt of the access response signal, themobile station 405 may send the base station the control signalperiodically or non-periodically through the control channel configuredbased on the control channel setup information included in ortransmitted separately of the access response signal. The control signalmay include the information on the DL narrow transmission beamsincluding the DL best narrow transmission beam, Channel StatusInformation (CSI) of the DL narrow transmission beams, UL SoundingReference Signal (SRS), and HARQ response signal for UL/DL datacommunication.

At step 7089 of FIG. 7 a, the mobile station 405 may transmit the DLbest narrow transmission beam (best beam) information and DLtransmission beam CSIs through the UL transmission beam corresponding tothe best UL transmission beam information received at step 707 on theresource region configured based on the control channel setupinformation received at step 707. At step 709, the mobile station 405may send the base station 401 the reference signal for UL channel in theresource region for UL SRS among the control channel configurationinformations received at step 707. The UL SRS transmitted by the mobilestation 405 at step 709 is the signal for use in determining the bestcombination among the UL transmission-reception beam combinations andmeasuring the reception performance on the transmission-reception beamcombination. The mobile station 405 and the base station 401 have totransmit and receive the corresponding signal more than once on thetransmission-reception beam combination.

At step 704 of FIG. 7 a, the base station 401 may receive the UL controlchannel, which the mobile station has transmitted in the resource regionconfigured based on the control channel configuration informationtransmitted at step 702 or 703, using the best UL narrow reception beamdetermined through the procedure of FIG. 5 a or its neighboringreception beams. At step 705, the base station 401 may attempt toreceive part of the control channel transmitted by the mobile station405 using all the narrow reception beams as at step 704. According to analternative embodiment, at step 704 or 705, the base station 401 mayattempt to receive the UL control channels transmitted by the mobilestation using the best wide reception beam determined through theprocedure of FIG. 5 a.

FIG. 7 b is a diagram illustrating a frame structure having a resourceregion for transmitting/receiving the access response signal accordingto an embodiment of the present invention. The access response signalmay be transmitted on the DL scheduling region 715 of FIG. 7 b or theresource region 716 reserved for the DL control signal region (DLcontrol block; DL CB). Its transmission time may be determined inconsideration of the UL access signal reception time or in a time windowpredetermined in consideration of the access signal transmission. Theresource region for transmitting/receiving the access response or thetransmission/reception time information may be shared between the basestation 401 and the mobile station 405 through the DL BCH 410 or 412 ofFIGS. 4 a and 4 b.

FIG. 8 a is a diagram illustrating a procedure of establishing aconnection based on the information exchanged between the base station401 and the mobile station 405 in the access procedure.

As described with reference to FIG. 7 a, the mobile station 401 receivesthe best UL transmission beam information and UL message transmissionresource scheduling information through the procedure of exchanging theaccess response signal. Afterward, the mobile station 401 transmits aconnection request message for connection establishment after the accessusing the corresponding transmission beam on the corresponding resourceregion at step 805. In this embodiment, the mobile station 405 transmitsthe connection request message including information on the best DLnarrow transmission beam determined through the procedure of 4 a and thetransmission beam reception performance information or part of theinformation. The connection request message including the best DL narrowtransmission beam and the transmission beam reception performanceinformation or part of the information may be transmitted to the basestation 401 one or more times based on the Hybrid Automatic RetransmitRequest (HARQ) technique. The mobile station 405 may receive a HARQfeedback in a predetermined DL resource region corresponding to the ULresource region on which the connection request message is transmittedor in the resource region corresponding to the DL control channelconfiguration information received along with the access response signalof FIG. 7 a.

As described above, the base station 401 schedules the resource for ULmessage transmission in the access response signaltransmission/reception procedure of FIG. 7 a.

Afterward, the base station 401 receives the UL connection requestmessage in the corresponding resource region at step 802. At this time,the best UL narrow reception beam determined in the procedure of FIG. 5a or its neighbor reception beams. According to an alternativeembodiment, the base station 401 may receive the UL connection requestmessage transmitted by the mobile station using the best wide receptionbeam determined in the procedure of FIG. 5 a. The UL connection requestmessage may include the information on the best DL narrow transmissionbeam and the reception performance of the transmission beam, and thebase station 401 may determine the best DL narrow transmission beam andthe reception performance of the transmission beam based on the ULconnection request message. The connection request message maytransmitted/received more than once repeatedly through the HARQ process,and the HARQ feedback may be transmitted in a predetermined DL resourceregion corresponding to the UL resource region in which the UE 405 hastransmitted the message or in the resource region corresponding to theDL control channel configuration information which the base station hastransmitted along with the access response signal of FIG. 7 a.

Upon receipt of the UL connection request message, the base station 401performs a contention resolution procedure for resolving the contentionamong the Mobile stations at step 803 to complete the connection setupprocedure. The base station 401 may select the mobile station 405allowed for access finally among the plural Mobile stations through thecontention resolution procedure and send the mobile station 405 thephysical layer, MAC layer, and the serving configuration information.The physical layer and MAC layer configuration information may includecontention-free new control channel information.

The message transmitted by the base station 401 for the contentionresolution procedure at step 803 may be transmitted through the DLnarrow transmission beam selected based on the best DL narrowtransmission beam indication information the reception performanceinformation of the transmission beam that are received along with theconnection request message. The base station 401 may send the mobilestation 405 the message using the narrow transmission beam selectedbased on the UL control channel information received in the procedure ofFIG. 7 a. The message for the contention resolution procedure may betransmitted/received more than once repeatedly using the HARQ technique.

The mobile station 405 may be allowed finally for access through theconvention resolution procedure at step 806. The mobile station 405 mayset up the connection based on the physical layer, MAC layer, andserving configuration information to enter the connected state. Thephysical layer and MAC layer configuration information may include newcontention free control channel information. The message for thecontention resolution procedure may be transmitted/received more thanonce repeatedly using the HARQ technique. The HARQ feedback may betransmitted in a predetermined UL resource region corresponding to theDL resource region in which the message has been transmitted or in theresource region corresponding to the UL control channel informationreceived along with the access response signal of FIG. 7 a.

FIG. 8 b is a diagram illustrating a frame structure including theresource for use in the procedure of FIG. 8 a. The frame includes aPDCCH region 807, an UL region 808, a DL region 811, a UL control block810, and a DL control block 809.

FIG. 9 is a flowchart illustrating the access response procedure of thebase station 401 according to an embodiment of the present invention. Atstep 901, the base station 401 transmits the SCH and BCH on every widetransmission beam at least once using at least one wide transmissionbeam as described with reference to FIG. 4 a. The informationtransmitted on the BCH may include P-BCH and S-BCH transmission time andresource information, DL NB-RS transmission time and resourceinformation, information on the resource reserved for UL access signaltransmission, access response signal transmission time and resourceinformation, and other UL/DL control single region configurationinformation.

At step 902, the base station 401 transmits the second reference signal(NB-RS) on the DL narrow transmission beam at the transmission timenotified through the BCH at step 901 as described with reference to FIG.4 a. The reference signal transmitted on the narrow transmission beam isreferred to as second reference signal. However, the claims of thepresent invention are not limited thereto. At step 903, the base station401 attempts to receive the UL access signal transmitted by the mobilestation 405 using at least one wide reception beam or narrow receptionbeam as described with reference to FIG. 4 a.

At step 904, the base station 401 determines whether an UL access signalis detected. If the UL access signal is not detected, steps 905 to 908are skipped. If the access signal is detected, the base station 401determines at least one DL narrow transmission beam or DL widetransmission beam to be used for transmitting the access response signalbased on the best DL wide transmission beam information or best DLnarrow transmission beam group information included in the UL accesssignal and transmits the access response signal using the determinedtransmission beam. After determining the transmission beam to be usedfor transmitting the access response signal, the base station 401transmits the access response signal using the transmission beam at step905. The access response signal may include a Temporary ID (TID) to beused in the procedure subsequent to the access, best uplink transmissionbeam information, control channel initial configuration information tobe used in the channel configuration procedure following the accessresponse procedure, and scheduling information for resource to be usedin the channel configuration information, or part of them. The whole orpart of the above information may be transmitted as a signal independentof the access response signal or along with or without the accessresponse signal.

At step 906, the base station 401 attempts to receive the UL controlchannel transmitted by the mobile station 405 using the best ULtransmission beam based on the control channel configuration informationof step 905. The information transmitted through the UL control channelmay include the information indicating the DL narrow transmission beamsincluding the best DL narrow transmission beam, the Channel StatusInformation (CSI) of the DL narrow transmission beams, and the ULreference signal (Sounding Reference Signal). The base station 401 maydetermine the best DL narrow transmission beam to be used in theconnection setup procedure and the reception performance of thetransmission beam through the operation of step 906.

Afterward, the base station 401 may receive the connection requestmessage transmitted by the mobile station using the HARQ technique atstep 907. The base station 401 transmits a contention resolution andconnection setup message in response to the connection request messageusing the HARQ technique at step 908 and ends the signaltransmission/reception operation. The connection setup message of step908 may include new contention free control channel setup information.The connection request message transmitted by the mobile station 405 atstep 907 may include the best DL narrow transmission beam indicationinformation and the transmission beam reception performance information.The HARQ feedback used in the HARQ operation at steps 907 and 908 may betransmitted in the predetermined UL/DL resource region corresponding tothe UL/DL resource region in which the messages have beentransmitted/received or in the resource region corresponding to thecontrol channel information transmitted along with the access responsesignal at step 905.

FIG. 10 is a flowchart illustrating the UL access signal transmissionprocedure of the mobile station 405 according to an embodiment of thepresent invention.

The mobile station 405 receives the DL SCH and BCH transmitted on thewide transmission beam using at least one reception beam at step 1001 asdescribed with reference to FIG. 4 a. At step 1002, the mobile station405 receives the DL second NB-RS at the transmission time indicatedthrough the BCH received at step 1001 as described with reference toFIG. 4 a.

Next, the mobile station 405 selects the transmission beam andtransmission time for transmitting the UL access signal at step 1003.For example, the mobile station 405 may select all availabletransmission beams. According to an alternative embodiment, the mobilestation 405 may use the best DL wide transmission beam and best DLnarrow transmission beam selected in the procedure of receiving the DLSCH and BCH and DL second reference signal (NB-RS) and some ULtransmission beams selected based on the reception beam informationcorresponding to the DL beams.

Next, the mobile station 405 transmits the UL access signal using theselected UL transmission beam at step 1004. After transmitting the ULaccess signal, the mobile station 405 waits for the response signal ofthe base station in reply to the UL access signal during a predeterminedwaiting time period. Here, the waiting time period may be set to a valuedetermined at step 1005 or received through the BCH at step 1001.

If the access response signal is received during the waiting time periodat step 1006, the mobile station 405 determines that the UL access issucceed and starts uplink control channel transmission at step 1008according to the control channel configuration information receivedalong with the access response signal. The information transmittedthrough the UL control channel may include the information on the DLnarrow transmission beams including the best DL narrow transmissionbeam, DL narrow transmission beams Channel Status Information (CSI), andUL reference signal (UL Sounding Reference Signal).

At step 1009, the mobile station 405 transmits the connection requestmessage using the UL transmission beam corresponding to the best ULtransmission beam information received along with the access responsesignal at the time and on the resource indicated in the schedulinginformation received along with the access response signal at step 1006,using the HARQ technique. The mobile station 405 receives the contentionresolution and connection setup message transmitted by the 401 inresponse to the connection request message using the HARQ technique atstep 1010 and ends the UL signal transmission operation. The connectionrequest message transmitted by the mobile station 405 at step 1009 mayinclude the information on the best DL narrow transmission beam and thereception performance of the transmission beam.

The HARQ feedback used in the HARQ operation at steps 1009 and 1010 maybe transmitted in the predetermined UL/DL resource region correspondingto the UL/DL resource region in which the messages have beentransmitted/received or the resource region corresponding to the controlchannel information received along with the access response signal atstep 1006.

If the access response signal is not received at step 1006, the mobilestation 405 determines whether to retransmit the UL signal transmittedaccording to a predetermined rule at step 1007. The determination may bemade based on the information about whether to retransmit uplink signalwhich is received through the BCH at step 1001, UL maximum transmissionpower, and number of UL signal retransmission times. If it is determinedto retransmit the UL signal at step 1007, the mobile station 405 returnsthe procedure to step 1003 to perform the operation of transmitting theUL access signal. According to an alternative embodiment, if it isdetermined to perform retransmission at step 1007, the mobile station405 may return the procedure to step 1004 without selecting thetransmission/reception direction again.

If it is determined to do not retransmit the UL signal according to thepredetermined rule at step 1007, the mobile station 405 performs anoperation for the case of UL transmission failure at step 1011 and endsthe UL transmission operation. The operation for the case of ULtransmission failure may include the operation of reattempting the ULsignal transmission from the beginning after a time period predeterminedor received in the BCH at step 1001.

FIG. 11 is a block diagram illustrating the configurations of the basestation 401 and the mobile station 405 according to an embodiment of thepresent invention.

According to an embodiment of the present invention, the base station401 includes a scheduler & controller 1141, a Radio Frequency (RF) unit1145, and data queues 1143.

According to an embodiment of the present invention, the mobile station405 includes a transceiver (Front end) 1167, a demodulator 1169, adecoder 1171, a controller 1161, an encoder 1163, and a modulator 1165.

The scheduler & controller 1141 of the base station 401 controls the RFunit 1145 according to above described embodiments. Particularly, thescheduler & controller 1141 selects an appropriatetransmission/reception beam in the middle of the UL access operationaccording to the method of FIGS. 4 a to 10. The scheduler & controller1411 also controls the RF unit 1145 to perform communication using theselected transmission/reception beam.

The data queue 1143 of the base station 401 stores the data receivedfrom an upper network node to the queues corresponding to the respectiveMobile stations or services, and the scheduler & controller 1141controls the user-specific or queue-specific data in consideration of DLchannel condition information, service characteristics, and fairness.The RF unit 1145 transmits the selectively controlled data signal orcontrol signal to the mobile station 405. The RF unit 1145 transmits aresponse in response to the UL access signal of the mobile station 405and selects transmission/reception beam to perform radio communicationunder the control of the scheduler & controller 1141.

The control unit 1161 of the mobile station 405 performs the UL accessprocedure according to the above described embodiments. The control unit1161 controls the transceiver (front end) 1167) to acquire the besttransmission/reception beam information or notify the base station 401of the best transmission/reception beam information in the middle of theUL access procedure. The transceiver (front end) 1167 receives the radiocommunication signal, the demodulator 1169 demodulates the receivedsignal, the decoder 1171 decodes the demodulated signal, and the controlunit 1161 makes a decision on and processes the decoded signal. Thecontrol unit 1161 transfers the signal to be transmitted to the decoder1163, which decodes the received signal. The decoded signal istransferred to the modulator 1165. The modulator 1165 modulates thereceived signal and transfers the modulated signal to the transceiver1167. The transceiver 1167 transmits the signal to the mobile station401 over a radio wave.

Although the description has been made with reference to particularembodiments, the present invention can be implemented with variousmodifications without departing from the scope of the present invention.Thus, the present invention is not limited to the particular embodimentsdisclosed but will include the following claims and their equivalents.

Advantages and features of the present invention and methods ofaccomplishing the same may be understood more readily by reference tothe detailed description of exemplary embodiments and the accompanyingdrawings. The present invention may, however, be embodied in manydifferent forms and should not be construed as being limited to theexemplary embodiments set forth herein. Rather, these exemplaryembodiments are provided so that this disclosure will be thorough andcomplete and will fully convey the concept of the invention to thoseskilled in the art, and the present invention will only be defined bythe appended claims. Like reference numerals refer to like elementsthroughout the specification.

Detailed description of the present invention is made with reference tothe drawings for explaining the invention with the embodiments of thepresent invention.

It will be understood that each block of the flowchart illustrationsand/or block diagrams, and combinations of blocks in the flowchartillustrations and/or block diagrams, can be implemented by computerprogram instructions. These computer program instructions may beprovided to a processor of a general purpose computer, special purposecomputer, or other programmable data processing apparatus to produce amachine, such that the instructions, which execute via the processor ofthe computer or other programmable data processing apparatus, createmeans for implementing the functions/acts specified in the flowchartand/or block diagram block or blocks. These computer programinstructions may also be stored in a computer-readable memory that candirect a computer or other programmable data processing apparatus tofunction in a particular manner, such that the instructions stored inthe computer-readable memory produce an article of manufacture includinginstruction means which implement the function/act specified in theflowchart and/or block diagram block or blocks. The computer programinstructions may also be loaded onto a computer or other programmabledata processing apparatus to cause a series of operational steps to beperformed on the computer or other programmable apparatus to produce acomputer implemented process such that the instructions which execute onthe computer or other programmable apparatus provide steps forimplementing the functions/acts specified in the flowchart and/or blockdiagram block or blocks.

Furthermore, the respective block diagrams may illustrate parts ofmodules, segments or codes including at least one or more executableinstructions for performing specific logic function(s). Moreover, itshould be noted that the functions of the blocks may be performed indifferent order in several modifications. For example, two successiveblocks may be performed substantially at the same time, or may beperformed in reverse order according to their functions.

The term “module” according to the embodiments of the invention, means,but is not limited to, a software or hardware component, such as a FieldProgrammable Gate Array (FPGA) or Application Specific IntegratedCircuit (ASIC), which performs certain tasks. A module mayadvantageously be configured to reside on the addressable storage mediumand configured to be executed on one or more processors. Thus, a modulemay include, by way of example, components, such as software components,object-oriented software components, class components and taskcomponents, processes, functions, attributes, procedures, subroutines,segments of program code, drivers, firmware, microcode, circuitry, data,databases, data structures, tables, arrays, and variables. Thefunctionality provided for in the components and modules may be combinedinto fewer components and modules or further separated into additionalcomponents and modules. In addition, the components and modules may beimplemented such that they execute one or more CPUs in a device or asecure multimedia card.

The mobile terminal according to an embodiment of the present inventionis a portable electronic device such as a mobile phone, a PersonalDigital Assistant (PDA), a navigation device, a digital broadcastreceiver, and a Portable Multimedia Player (PMP).

It is to be appreciated that those skilled in the art can change ormodify the embodiments without departing the technical concept of thisinvention. Accordingly, it should be understood that above-describedembodiments are essentially for illustrative purpose only but not in anyway for restriction thereto. Thus the scope of the invention should bedetermined by the appended claims and their legal equivalents ratherthan the specification, and various alterations and modifications withinthe definition and scope of the claims are included in the claims.

Although exemplary embodiments of the present invention have beendescribed in detail hereinabove with specific terminology, this is forthe purpose of describing particular embodiments only and not intendedto be limiting of the invention. While particular embodiments of thepresent invention have been illustrated and described, it would beobvious to those skilled in the art that various other changes andmodifications can be made without departing from the spirit and scope ofthe invention.

1. An uplink access method of a mobile station, the method comprising:receiving a synchronization channel and a broadcast control channel froma base station; selecting a transmission beam for transmitting an uplinkaccess signal based on a result of receiving at least one of thesynchronization channel and broadcast control channel; transmitting theuplink access signal using the selected transmission beam; and receivingan access response and a control channel initial configurationinformation from the base station in response to the uplink accesssignal.
 2. The method of claim 1, further comprising: transmitting, atthe base station, the synchronization channel and the broadcast controlchannel through a wide transmission beam; and transmitting a referencesignal through a narrow transmission beam.
 3. The method of claim 2,further comprising selecting at least one of a wide downlinktransmission beam, a narrow downlink transmission beam, and a downlinkreception beam corresponding to the downlink transmission beam based onat least one of the synchronization channel, the broadcast controlchannel, and the reference signal.
 4. The method of claim 1, whereintransmitting the uplink access signal comprises including at least oneof selected wide downlink transmission beam information and selectednarrow downlink transmission beam group information in the uplink accesssignal.
 5. The method of claim 2, wherein receiving the access responseand the control channel initial configuration information from the basestation in response to the uplink access signal comprises selecting adownlink reception beam based on the synchronization channel, thebroadcast control channel, and the reference signal; and receiving theaccess response and the control channel initial configurationinformation through the selected downlink reception beam.
 6. The methodof claim 1, wherein at least one of the access response and the controlchannel initial configuration information comprises a temporaryIdentifier (TID) for use in a procedure after the access, selecteduplink transmission beam information, control channel initialconfiguration information for use in a channel configuration procedureafter a access response procedure, and scheduling information forresource to be used in the channel configuration procedure.
 7. Themethod of claim 2, further comprising: selecting a downlink receptionbeam based on at least one of the synchronization channel, the broadcastcontrol channel, and the reference signal; and selecting an uplinktransmission beam corresponding to the selected downlink reception beam.8. An uplink access response method of a base station, the methodcomprising: receiving an uplink access signal from a mobile station;acquiring a downlink transmission beam indicator from the uplink accesssignal; and transmitting a response signal and control channel initialconfiguration information through a downlink transmission beam indicatedby the downlink transmission beam indicator.
 9. The method of claim 8,further comprising determining a transmission beam selected in uplinkand based on reception performance of the uplink access signal andselected wide reception beam or selected narrow reception beamassociated with the selected transmission beam, wherein receiving theuplink access signal from the mobile station comprises receiving theuplink access signal from the mobile station through a plurality of widereception beams or a plurality of narrow reception beams.
 10. The methodof claim 8, wherein at least one of the access response and the controlchannel initial configuration information comprises a temporaryIdentifier (TID) for use in a procedure after the access, selecteduplink transmission beam information, control channel initialconfiguration information for use in a channel configuration procedureafter a access response procedure, and scheduling information forresource to be used in the channel configuration procedure.
 11. A mobilestation for performing uplink access, the mobile station comprising: acommunication unit which receives a synchronization channel and abroadcast control channel from a base station; and a control unit whichselects a transmission beam for transmitting an uplink access signalbased on a result of receiving at least one of the synchronizationchannel and broadcast control channel, wherein the communication unittransmits the uplink access signal using the selected transmission beamand receives an access response and a control channel initialconfiguration information from the base station in response to theuplink access signal.
 12. The mobile station of claim 11, wherein thebase station transmits the synchronization channel and the broadcastcontrol channel through a wide transmission beam and transmits areference signal through a narrow transmission beam.
 13. The mobilestation of claim 12, wherein the control unit selects at least one of awide downlink transmission beam, a narrow downlink transmission beam,and a downlink reception beam corresponding to the downlink transmissionbeam based on at least one of the synchronization channel, the broadcastcontrol channel; and the reference signal.
 14. The mobile station ofclaim 11, wherein the communication unit includes at least one ofselected wide downlink transmission beam information and selected narrowdownlink transmission beam group information in the uplink accesssignal.
 15. The mobile station of claim 12, wherein the communicationunit selects a downlink reception beam based on the synchronizationchannel, the broadcast control channel, and the reference signal; andreceiving the access response and the control channel initialconfiguration information through the selected downlink reception beam.16. The mobile station of claim 11, wherein at least one of the accessresponse and the control channel initial configuration informationcomprises a temporary Identifier (TID) for use in a procedure after theaccess, selected uplink transmission beam information, control channelinitial configuration information for use in a channel configurationprocedure after a access response procedure, and scheduling informationfor resource to be used in the channel configuration procedure.
 17. Themobile station of claim 12, wherein the control unit selects a downlinkreception beam based on at least one of the synchronization channel, thebroadcast control channel, and the reference signal and selects anuplink transmission beam corresponding to the selected downlinkreception beam.
 18. A base station for performing uplink accessresponse, the base station comprises: a communication unit whichreceives an uplink access signal from a mobile station; and a controlunit which acquires a downlink transmission beam indicator from theuplink access signal, wherein the communication unit transmits aresponse signal and control channel initial configuration informationthrough a downlink transmission beam indicated by the downlinktransmission beam indicator.
 19. The base station of claim 18, whereinthe communication unit receives the uplink access signal from the mobilestation comprises receiving the uplink access signal from the mobilestation through a plurality of wide reception beams or a plurality ofnarrow reception beams, and the control unit determines a transmissionbeam selected in uplink and based on reception performance of the uplinkaccess signal and selected wide reception beam or selected narrowreception beam associated with the selected transmission beam.
 20. Thebase station of claim 18, wherein at least one of the access responseand the control channel initial configuration information comprises atemporary Identifier (TID) for use in a procedure after the access,selected uplink transmission beam information, control channel initialconfiguration information for use in a channel configuration procedureafter a access response procedure, and scheduling information forresource to be used in the channel configuration procedure.